At the beginning, the skin of the affected area is rough and thickened, with white flakes coming off, similar to the symptoms of dermatitis, however, the drugs used to treat dermatitis are ineffective. However, the skin of the affected area becomes red and hyperplastic with painful sensation after a long time, and some skin ulcers appear on the affected area and recur for a long time. The diagnosis can be confirmed by taking a skin biopsy of the lesion site at the hospital. After the diagnosis is confirmed, the lesion site and its outer edge of 5-10mm of normal skin will be removed together, and those with lymphatic and metastasis need chemotherapy to prevent spread. In the initial stage, decoction of Chinese herbal medicine Banlangen, Yinhua, forsythia and soapberry can be used to prevent skin cancer. Usually, long time ultraviolet radiation, and try not to contact with chemical carcinogens such as asphalt, tar and arsenicals can prevent skin cancer.